# ROS2 Project topics problem

**URL:** <https://get-help.theconstruct.ai/t/ros2-project-topics-problem/24261>\
**Category:** ROSDS Support\
**Created:** [May 9, 2023, 9:20pm UTC](https://get-help.theconstruct.ai/t/ros2-project-topics-problem/24261 "2023-05-09T21:20:26Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![girishkumar.kannan](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/girishkumar.kannan/32/6994_2.png) [@girishkumar.kannan](https://get-help.theconstruct.ai/u/girishkumar.kannan)\
**Post date:** [May 10, 2023, 6:30pm UTC](https://get-help.theconstruct.ai/t/ros2-project-topics-problem/24261/8 "2023-05-10T18:30:14Z")

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Hi @eblady ,

This post could be the solution: [ROS2 Topics "ros2 topic echo /cmd\_vel" fails - #7 by albertoezquerro](https://get-help.robotigniteacademy.com/t/ros2-topics-ros2-topic-echo-cmd-vel-fails/15030/7)

What you have to do is:

1. Reset all the terminals on the course, that is, by clicking the red X button on every webshell.
2. Then on every webshell that you will be using, you must type in these two commands before executing any other commands:

```bash
source /opt/ros/foxy/setup.bash
source /home/simulations/ros2_sims_ws/install/setup.bash

```

I believe this should definitely fix your problem. Let me know if you still have issues.

Regards,  
Girish

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